Electric heating element



Nov. 28, 1939. w. D. HARRIS ELECTRIC HEATING ELEMENT Original Filed Dec. 26, 1935 FIG.

JQIVENT R. Wm W) Jim? I kc ATTORNEY Patented Nov. 28, 1939 UNETED STATES i a Befiled for abandoned application Serisl No.

56,137, December 26, 1935.

This recollection January 12, 1937, semi No. 120,253

1 Claim. (or. col -c7) My invention relates to electric heating elements, which are designed to be used in connection with the i e-refining of used lubricating oil such as is described in my copending application, Serial No. 5,172, of which this application is a continuation in part. This application is substituted for application Serial No. 56,137.

As pointed out in that specification, the cliluents and light ends remaining in the oil, after treatment by the sulphuric acid, are vaporized in a still, which is host-eel by an electric element. In the vaporizing of these dil'uents in the still, prepara= tory to the chewing oil or" the purified or rerefined oil, sludge is deposited in the bottom of still.

One of the thsegreeeble features of the Work is the removal of sluclge from the still.

In the operation of the still the intense heat also produces 2. scale on the Wells of the casing sur rounding he electrically heated element or elemeets :lge deposits on this scale. is ohjectio. or two remorse-primarily hecause tl e s I ed the sludge ect as an insulation which so 1" 2*. ts the heot transfer from the electric elemew .o the oil in the still that en excessive count 0 c? is required in to raise tern verso of the oil to the required degree.

found is. practice that cl e to the heating element the e which has been deposited ct gsreventing the element the heat generated in the elecient rapidity so that the heat will l. metel in the casing.

result of this is eventually the insule ce so that the metol of which ceshe heated to so high a degree ilcity of the metal of which it is formed exceeded. When this occurs the casing will collapse and this breaks the expensive electric lng element which is mounted inside Another objectionable feature is that the mete! forming the enclosure for the heating element scale on the insideencl this sometimes results in short circuiting the heating element.

' The object of my invention is to provide 9. cas s, tor the electric heating elements, which will ot settle and upon which the sludge will not rich t and which will therefore not overheat encl brook the electric heating elements.

A further object is to so construct the casing so that it will he e. comparatively simple motter to clean it when desired.

A further object of my invention is to provide means for preventing the short circuiting shove referred to.

l /iy means of accomplishing the ioregomg objects may he more readily understood by having reference to the accompanying drawing, which is hereunto annexed end is 2. part of this specification, in Which Fig. l ise. side elevation of a. portion of the apparatus illustrated in the copezoding application above referred to in which the still is equipped my improved electric heating element, e. portion of the still being broken away to show the mounting of the element; and

Fig. 2 an enlarged sectional detailed view of the electric element, port of the Well being broken show the interior the construction.

reference num rels r fer to similer ts throughout the entire clesc ratios. 7

is shown in the drawing, I have illustrated the following ilnits-e sthi. l; condenser I 3; dilution l? 2 contact I g connections for connecting he still is p ieraloly formed W an outer shell temperatures his. the outer shell,

Although elements it ere mounts i2 oi the still i cml extend into and ion oi same. They are formed as clearly seen in the detail View of the ll oer case which may be of porceloin arotmcl which the resistance wire is wound or it may consist of e. plus porcelein (not shown) through which a, number of the resistance Wires are pesserl. This electric element is then mount-cal of e tubules sleeve or casing ii, the inner end it; or which is closecl, the other end, being closed, log a is from which the element is supported. e ll has its outer surface machined and finished and polished. 'l hds is their coated with e. lover of nickel plate it which is bufiecl until it is highly polished. The'cesing is plated inside and out with chromium 2i curl the outside chromium is their high y polished.

result of this construction is that the pores of the metal of which the tuhuler casing ill is termed ere completely and entirely closed with the resultant efiect that too scale will form on its surface and no sludge can deposit thereon, nor will the inside scale even when subjected to a high temperature; thus the danger of a short circuit is avoided. As a consequence there can be no insulating effect and I have been able in practice to materially reduce the cost of electric current used in the operation or the apparatus and I have also materially increased the life of the elements to an indefinite period or time where= as prior to my invention and discovery in 131120-- tice the elements were constantly being replaced and renewed.

Although Lhave described with some particularity a specific construction for embodying my invention, such description is not to be taken as a limitation upon my invention or as confining me to such specific details of construction, for it will be obvious to persons filled in the art that numerous changes in the 1--iion of the heating element might be resorted to without departing from the spirit of my invention as hereinafter claimed.

Having described my invention what I regard as new and desire to secure by Letters Patent is In an electric heating assembly for heating oil in a still, a tubular sleeve closed at one end, an

electric heating element formed oi resistance wire having a porcelain support mounted in said sleeve spaced from the walls thereof, the outer surface of said sleeve being machined smooth and highly polished, a layer of nickel deposited on the outer surface of said sleeve and a layer 0! chromium deposited on said nickel, a layer of chromium deposited on the interior of said sleeve, and means to mount the opposite end of said sleeve in a. still so that its interior is closed to the oil under treatment. 

